Die-casting machine



Jan. 19 ,;1926.

' 1,569,851 J. B. BUSHNELL DIE CASTING MACHINE Filed Oct. 2, 1 22 5 Sheets-Sheet 1 IN V EN TOR. Job/1 i. flush/re,

WIT/V655 ATTORNEYS.

Jan. 1 9 1926. 7 1,569,851 J. B. BUSHNELL DIE CASTING MACHINE Filed Oct. 2, 1922 I 5 sn s-sheeg 2 IN V EN TOR. Jo/yrz 5 51/5/1776 r v/ 71/555 7 BY %I4 rowl Jan. 19 1926. 1,569,851

' JQB. BUSHNELL DIE CASTING MAcHIim s Sheets-Sheet 4 INVENTOR.

A TTORNEYS."

Jan. 19,1926. 1,569,851

J. B. BUSHNELL 1m: CASTING MACHINE Filed Oct. 2. 1922 5 sheets-Sheet s A TTORNEYS.

Patented Jan. 19, 1926.

UNITED STATES PATENT oF lcE.

JOHN B. BUSliNELL, OF BERKELEY, CALIFORNIA, ASSIGNOR TO BUSHNELL MANU- CALIFORNIA, A CORPORATION OF CALI- FACTURING CO. INC. OF BERKELEY,

FORNIA.

Application titled October 2,1922. Serial No. 591,713.

To all whom it may oonaemg Be it"known that, 1, JOHN 'B.. B sr 1NnLL, a citizen of theiUnited States, and a. resident My invention relates to a machine for dies. Machines of this making castings in general character and their mode of operation are now .well known. The advantages of making castings by permitting the metal or alloy to flow into a space defined by ai metal die, are quite numerous. and include the obvious ones for example that the cast ings are maintained accurate to dimensions to a comparatively high degree and also that there is no -need'for patterns or the like. In fact, the castings are in many: instances so,- accurately'formed by this ,process that little tivelyfexpensive dies, tributed in preventing if any, subsequent machine finishing is required. With'machinesas' heretofore made, it has beennece'ssary toconstruct comparaand this, facthas contion of die-casting. It isobvious that the less expensively these dies may be constructed, the more universal becomes the use of suchmachines, even if there beslight additional complications needed in the machine itself, It is one ofthe obiects of my invention to'supply a die casting machine in which some of. the complications of the die construction may be obviated.

' The 'dies in suclifmachlne are usually made which are disposed on relatively in parts,

' movable portionsof the machine, for facilito produce displacement between the parts tating the extraction of the completed casting. For this purpose, there is provided'a movable-carriage for one of the die parts. These die' parts must be accuratelv alined before the metal is poured in, dies are heavy, the stresson the carriage or support may strain the structure sufficiently of: the die; It is thus another obiect of my invention to provide a simple and accurate form of adjustrhent'foi alining the parts of the die. t 1

Upon bringing the parts of the die together it isessential to provide a tight joint between them, and for this purposeacon- -siderable force must be exerted. This joint must be sufliciently tight to prevent itbeing nrnoiis'rme MACHINE.

the widespread adop movable metal container in the form of a and where the will be set affected by the tendency of the metal within thedie to expand the parts. This tendency is quite pronounced where the metal is squirted into the die under pressure. A toggle link,

.erator to e r ert an exhausting stress on the toggle. Vvith the aid of my invention, it is possible to urge the die parts very-strongly together without the necessity of excessive effort on the part of the operator.

It is still another object of my invention tO'prOVide, an extractor for the completed casting, which extractor is made partof the machine and may be used with any of the dies. It is thus unnecessary to provide an extractor mechanism for each die. I I As each casting is made by the die, a sprue is'formed that ,usually must be cut away beother object of my invention to provide a sprue cutter-that is adjustable in such a way fore the casting can be removed. Itis anas tobe applicable to any die used in the machine. v 1

In order to force metal into the die, a

gooseneck is usually employed, one end of which maybe madeto communicate with the sprue hole of the die,

gooseneck is arranged to be dipped into a reservoir of metal kept in a moltedstate, and to be raised with its charge of metal so as to permit the die to be filled therefrom. It is another object oimy inventionto provide a simple and quick control for the movements of this gooseneck;

q and the other to be a connected to a source of air pressure. The

In connection with some of the dies, it is necessary to use cores which must be extracted after the casting is made. Thisextraction requires a good deal of force due to the contraction of: the metal around the cores. It is another object of my invention to'provide a power operated core puller, adaptable either for pulling straight cores, or for the removal of threaded cores that are psed for producing tapped holes in the castmg. a

v My invention possesses other advantageous features, some of which, with the foregoing forth at length in the following description, where .I shall outline in full that form of the invention which I have selected "for illustration in the. drawings accompany cation. In the drawings I have shown but one embodiment of my invention, but it is to V be understoodthat I am not to be limited thereto, since the invention as expressed 111,

the claims may be embodied in other forms as well.

Referring to the drawings: Figure 1 is a side view of a complete machine embodying my invention Fig. 2 is a central longitudinal sectional view of the complete machine;

Fig. 3 is a top plan view of the same;

Fig. 4 is a sectional view taken along the line 44 of Fig. 3;

Fig. 5 is a sectional view taken; along the 1ine-.55 of Fig. 3;

Fig. 6 is a cross sectional view of the machine, taken along the line 6-6 of Fig. 2;

Fig. 7 is another cross sectional view taken along line 7-4 of Fig. 2;

Fig. 8 is an enlarged section of the machine showing some of thesprue cutter and casting extractor details;

Fig. 9 is an enlarged 9--9 of Fig. 8;

Fig. 10 is an enlarged view of the sprue cutter, showing the arrangement for adjustment thereof;

Fig: 11 is-an enlarged section along line 1l11 of Fig. 1, showing how the carriage may be'adjusted; i

Fig. 12 is an enlarged plan view of the eccentric connection for the control of the gooseneck; and

Fig. 13 1s a section along line diagrammatic view of the power control for the pulling of the cores.

In general the die casting machine includes a structure made a of a pair of relatively movable parts, to w ich the die halves may be attached. Thusthe stationary head 21 is adapted to carry the die half 22, while a movable head 23 carries the other die half 24. The stationary head 21 may conveniently be formed integral with the side of a furnace 25 for heating the. metal used in casting. In Fig. 8 the die halves 22 and 24 are shown moved together in a position ready for casting, and inorder to move the die half 24, the movable head 23 is carried by a wheeled carriage 25'. The wheels 26 of the carriage may beappropriately guided on a plurality of rails 27 in the present instance shown as bars of round cross section.

The rails 27 are shown as sup orted at one end by the standard 2 8 by the aid of the nuts 29 engaging threaded portions of the rails which extend through appropriate apertures in the standard. At the other end these rails 27 may extend into and be supported by the stationary head 21. If necessary or desirable an intermediate standard 30 may be used to prevent undue strains in the rails 27 The stationary portion 22 of the die may be fastened as by bolts to the head 21. Sine;

'is the sprue forming member 31 of the die half 22, and in this way the metal may be supplied to the die directly from the furnace 25,- in a'manner that will be described in greater detail hereinafter.

The movable die half 24 is likewise appr0- priately fastened to the movable head 23, and is designed to interengage with the stationary die half 22, upon movement of the carriage 25 to the position shown in Fig. 8. This carriage is made .up of appropriate parts to form a box-like structure with four upper wheels and four lower wheels for guiding its-movement on the rails 27. The movement of this carriage is effected by a toggle mechanism operated manually. The toggle is formed of the links 32 and The link 32 is forked as shown most clearly in Fig. 3, and two links 33 are used, one in each fork. These links 33 are appropriately pivoted on the rear cfthe carriage 25, in the lugs 34 fastened thereto. In order to accommodate the machine for varying sizes and thicknesses of dies, the pivoted end of forked link 32 is carried on a longitudinally adjustable plate 35, which slides upon the rails 27. This plate is held in adjusted position by means of the stud 36 which passes through an aperture in the standard 28, and is held in rigid relation therewith by the nuts 37. With this construction only a pair of nuts ned be unfastened and refastencd for an adjustment.

The toggle is manually straightened and broken by the aid of spoke wheel 38, which .may be clutched to the forked link 32 for rotating this link, so that the toggle may be straightened and the carriage 25' urged to the right in Fig. 3 so as to bring the two die heads very near each other. However,

after the toggle is brought substantially to a straight position, I am enabled. with my device, to urge the pivot of link 32 still fur- [her to the right with a great leverage, and thus clamp the die halves securely together. This closing movement is produced with a very great leverage.

For the purpose of providing the closing movement, the shaft 39 has an eccentric portion 40 upon which fits the link bosses 41. Akey 42 is slidable in a slot 43 in the portion 40, and is urged in one direction by means of a spring 44 disposed in the hollow portion of shaft 39. The key 42 is attached to a guided push rod 45 passing through the lll) shaft The shaft is iournaled for rotation in the ears or bosses 46 of the stationary member 35. The link bosses 41 have a space keyway 46 by the aid of push rod 45. The

' spoke wheel 38 is then rotated still further and this causes theeccentric portion 40 of the shaft 39 to rotate within the bosses 41. This'in turn urges the center of-the bosses in the direction in which the eccentric center is moved; and since the eccentricity may be made comparatively small, a great leverage may be exerted by this means for urging the dies together... The rotation of the portion 40 about an eccentric center thus serves the very useful purpose of multiplying a relatively small force applied at the spoke wheel 38. It has been found that no difliculty is obtained with this arrangement to make an oil tight joint between the die halves. In order to separate the dies, it is merely necessary to rotate the spoke wheel 38 in a coun tcrclockwise direction. The first part of the rotation serves .to b'ring the key 42 into alinement with the keyway 46 and when this occurs the spring 44 causes engagement between them. F rom that point on, the link 5.12 is clutched to the shaft 39 and continued rotation simplybreaks the toggle.

After the die halves have been brought together to the position shown in Fig. 8, the

metal is introduced through the sprue forming member 31. To do this, a gooseneck 47 is adjustably supported within the furnace 25, whereby it -may be dipped into the molten metal 48 in the pot 49 and afterward haveits small end brought into registry with the sprue opening. By dipping the goose- -n-eck into the pot 49, it becomes filled, and

the capacity of this gooseneck is made large enough to take care of the maximum size of castings handled by the machine. Appro-. priate means for heating the pot 49 may be provided near the base of furnace 25. After. the small end of the gooseneck 47 is brought into the positionof Fig. 2, air under pressure may be admitted through pipe 50 at the large end of the gooseneck.

The gooseneck 47' is fastened to a strip 51 which extends exteriorly of the furnace 25 and is guided in a guide or carrier 52. This carrier is appropriately slotted for the accommodation of the'strip 51, and for guiding the goosenec'k in its vertical movement for taking up a charge of the molten metal 48. This vertical movement is effected by the aid of a counter-weighted lever 53. pivoted at 54 to a pin 55 which in turn is pivoted on a vertical axis in a. bracket 56 attached near-the top of the furnace. The lever 53 is attached by links 57 to the strip 51, so that upon rotation oftlie lever about its pivot 54 .the gooseneck is moved vertically. The pivoted pin 55 and links 57 permit the gooseneck ,to have lateral move ment toward and fromthe spr'ue forming member 31, and the lever 53 is furthermore arranged in a diagonal line for convenience of operation. I

The lateral movement of the gooseneck 47 is effected by moving the guide 52 in a horizontal direction. For this purpose the guide carries a boss or projection which enters into a socket 59 in a carrier 60. This carrier is slidable in a horizontal direction in upon which the carrier 60 is pivoted. This isshown most clearly in Fig. 12. Upon.

straightening the toggle, it is possible to apply a still greater force to urge the small end UfgOQSGIlGCk 47 against sprue forming most conveniently effected by the aid of a rod inserted in any of the apertures in the head 68 of the pin 66. The rotation of pin 66 should be toward the left as seen in Fig. 3 to tighten the connection, and in the. opposite direction to loosen it.

\Vith these controls of the gooseneck, it is member 31 by rotating this pin. This is possible to moveit quickly into the metal 48, Witl'idraw it after it is charged, and bring it into registry with the sprue forming inember 31. After this is accomplished the air 1S admitted-through the armored cable 69 leading to an air control box/T0. After the die is filled with the metal and it has ooled sufiiciently, the air pressure is released, and the gooseneck is moved away.

The die halves are usually so arranged that the sprue or waste metal,.filling the inlet to the die, may be cut away and allowed to return into the pct 49. For this purpose ther are alined apertures dcsignated'at 71 in Fig. 8 in the die halves, which apertures form the sprue and extend entirely through 'both die halves. The back end of this aperture is closedby a sprue cutter 72 comprising an axially movable round bar arranged to slide in .the apertures 71. When this, bar

the sprue is cut and ejected into the furnace 25t-lirough airbpening T3 in the stationary plate 21. -.-The movement of the cutter may be eil'ected'by'the aid of a pinion '74; rotatable'about apivot 7 5 in a bracket 76. ThlS bracket is attached'to' the"-'rear plate/Z7 of the carriage 25. The pinion 74.- engages with a rack 78 which is of square cross section as shown in Fig. 9, and is slidablewithin the bracket 76. The sprue cutter 72 is adjustably held within-a groove -7 9 cut in the rack 78, and for this purpose astrap 80 is used, which engages one of a series of necks or slots 81 in the sprue cutter. These slots are shown most clearly in Fig. 10. It is thus evident that the position of cutter 72 may be adjusted by unfastening the strap 80 from the top of the rack, and moving the cutter until another of the notches or slots 81 is in position to be engaged by the strap 80. This strap may then again be tightened by aid'of screws 82. The adjustment of the length o f the sprue cutter is necessary in or:

der- 1,) take care ofthe varying widths of the dies handled by the machine, and thus to provide for the complete remo al of the sprue after it is out. It is not essential to have a fine degree of adjustment of this length, since it is merely necessary to make sure that the sprue cutter extends at least entirely through the die upon complete movement of the rack 78. This movement is effected by the aid of a handle 83 attached to the pinion 74. The sprue cutter 72 is furthermore guided in its axial movement by a hollow tubular member 84 which is shown as supported upon the rear of the movable head 23, by the aid of the threaded portion 85. From the foregoing description, .it is evident that movement of the handle 83 of .Fig. l in the direction of the arrow causes tire mechanism is duplicated for each die.

lVith the aid of my invention, such duplication is avoided in a great measure; it is merely necessary to provide on each die an arrangement shown somewhat diagrammatically in Fig. 8. This arrangement consists of a plate 86 held on posts 87 which slide within the die half 24 and serve, when plate 86 is moved to the right, toengage the casting within the die and extract it. The movable head 23 may be apertured for the accommodation of these posts 87.

Furnished with the machine itself is a device for moving the plate 86, and in the embodiment shown this device includes a rack and pinion movement. The rack 88 is stationary "and is conveniently formed on vthe under side of the tubular member 84.

The pinion 89 is rotatably supported in bracket 90 slidable upon the member 84, which thus serves also as a guide for this bracket. is attached a lever or handle 92. \Vhen this handle is pulled in the direction indicated by the arrow of Fig. 2, the entire bracket is moved to the right. The bracket 90 has a plurality of apertures 93, 9a which are adapted to accommodate the rods 95. These rods engage the extractor late 86 and are adjustably held to the brac et 90 by the aid of the nuts 96 which engage the threaded portion of the rods 95. The engagement between these rods and plate 86 may also be a threaded one. In order to facilitate the insertion of these rods into the threaded apertures in the plate 86, they may be fiattened as at 97 for convenience in turning. Due to the provision of the long apertures 93, it is possible to make the rods 95 fit varying sizes of plates 86. From the foregoing description, the operation of the extractor device is apparent.

In many instances before the casting can be extracted, it is necessary to remove cores which have'been inserted within the die in a direction perpendicular to the movement ofthe carriage 25'. iVhere there are more K than one core to be pulled, to do so by hand is a long process. iVith the power core puller shown, four cores may be pulled simultaneously by power In Fig. 8 I show a straight core 98 and a threaded core 99 within the die half 24. This threaded core is used for producing a tapped hole in the casting. The pulling of core 98 is effected by the aid of a rack and pinion arrangement, which is shown in greater detail in Figs. 7 and 8. In these figures I show three separate rack arrangements for pulling three straight cores and a fourth for pulling the threaded core 99. However, since all three of the straight'core pulling devices operate on substantially-the same principle. I shall describe but one of them in detail. Furthermore the number of core pullers needed depends upon the particular die used, and it is possible to substitute for any of-the straight core pulling devices, a threaded core pulling device, or vice versa.

To pull the core 98, then, I employ a rack 100 having at its ends a threaded socket 101 or the like by means of which it may be at; tached to the core 98. The rack 100 meshes with a pinion 102 which is splined to a shaft 103, so as to permit only relative axialmove- -ment between the shaft and pinion. This shaft is supported on a bracket 104 which is To the shaft 91 of the pinion 89 fastened by meansof bolts 105 to the movable head .23. -Thesebolts engage long slots 106jin the head,,. thereby permittingadjustment of the core puller in a direction transverse to the movement of the die halves. The

'shaft103 supports the guide 107 for the rack 100. T

y is guide is slidabl'e along the shaft 103, and is, prevented from rotating by the engagement of the socket portion101 of the rack 100 within the die head. The

arrangement is such that this end Qf the rack and of the bracket 104, the shaft 103 also carries a crank 108. This crank is keyed to the shaft. ."A drum'109 is free to rotate over the shaft, and is shown as enclosing the crank 108 M Toj-the drum is attached a sprocketv wheel 110. F or causing the drum to drive the sl1aft,";I"provide shoes 111 and'112, fastened-by bolts '113Jonthe inside of the drum 109, whereby upon rotation of the drum in either, direct on 'one'or theother of the shoes will eventuallyfengagc the crank 108 and cause rotation of shaft 103. The position of shoes'lli'or 112is adjustable on the inside of drum 109.,bythe aid of the 'seriesot aperj; tures 114, and in this way it is possible to determine the point when the shaft will begin to be rotated in either direction. The three other drums 115, 116 and 117 are similarly providedwith adjustable shoes. A common element is used to rotate all four drums simultaneously, as for example a sprocket chain 119 which passes over all of the sprocket wheels. It 1s thus evident that a source of motion, such as the small electric motor 118, which may beconnected to drive any one of the drums or the chain 119, serves to drive all of them simultaneously. The rotation of the drums in one direction serves to pull the cores, and rotation in the opposite direction serves to insert the cores. By properly adjusting the positions of the shoes 111 and 112 in each of the drums, it is possible to insure that all of the cores will reach the end of their travel within the die head 24 substantially at the same time, irrespective of the relative lengths of the cores. Thus if for instance in Fig. 6, the core op erated by drum 116 is the longest, and the cores operated by the drums 109 and 117 are shorter, then thepulling of the core associated with drum 116 should beginbefore the pulling of the others. Ifthis were not done,

it would be necessary toprovide for a comparatively large movement of the racks, even if the cores themselves might be short, and such a movement would pull out the core entirely from the die 24. Since the rack 100. is guided both by the guide 107'and the core hole, it is evident that if this should happen,

then there w ould be no opposition "to a bodily rotation of the rack aboutthe axis of shaft-103.. To efiect'this result, then, the shoe 120 is made to engage thecrank 121 of drum 116 first," and afterward the other cranks en a e at the ro er time so that all c g g P P of thecores will en ment simultaneously. The insertion of the cores. is etfectedby the'engagement of the other shoes 113,122 and 123 when the direc-' tion of the driveis reversed.

The power .arran ement is diagrammaticallyillustrated in ig. 13, where mains 12 1 form a source of either A. G. or D. G.felectric power, supply current to the motor118 through connecting devices 125 and 126.

These devices may be arranged to be automatically operated to disconnect the motor in response to the completion of the core movement, butfor the sake of simplicity they are their outward move merely shown as manually operated switches.

'The particular mechanical connection between the motor shaft" and the sprocket wheels or chain is of no especial importance,

resentinstanceit is shown dia-n small and in, the

grammatical 1y as comprising a sprocket wheel 12,7 directly on theshaft of the motor and engaging the chain 119.

i In some instances, as mentioned heretofore, the"'core to be ulled is a threaded one, and therefore to pu l it requires a slightly modified form of apparatus in place of the rack and pinion 102. Such a modified arrangement is shown in connection with the drum 115 of Figs. 7 and 8. The shaft 128 in this instance rotatesa bevel gear 129 which is fastened to the shaft 128. This gear in turn serves to rotate the bevel gear 130 and the rod 131. This rod is splined to the sleeve 132 fixed to the gear 130 so as to allow relative axial movement. The core to be pulled is connected with rod 131 which serves to rotate it out of the casting in the die,'or to insert it into the die A support 135 is slidable on shaft 128, and carries the bevel gears 129 and 130.

Before any great success can be attained with die casting, it is necessary to insure correct alinement of the die halves. This is especially necessary where the dies are heavy and cause deflections or strains in the various supporting elements for the dies. In the, present instance I show a scheme whereby the die halves may be very accurately alined. For this purpose the carriage 25 is made adjustable in either a vertical or horizontal di rection with respect to the stationary head 12. How this adjustment is efi'ecte'd in the present instance is illustrated in Fig. 11, which shows one of the roller mountings on the carriage. The carriage is supported upon a stout pin 133 which may be adjusted in the aperture 13 1 of the carriage. By "sliding this pinaxially within the aperture horizontal"adjustment may be effected, and

'the adjustment may be secured by the aid of the set screw 135 held in the carriage 25. All four of the rollers may be thus ad usted until the proper horizontal position of the carriage 25 is obtained:

For securing vertical adjustment of the carriage, that portion 136 of the pin 133 which carries the roller 26 is made eccentric to the other portion. In this way a slight rotation of the pin within the aperture 134 serves to vary the height of the carriage 25. Both adjustments are made while the carriage is held off the rails 27 by any appropriate means.

'The mode of operation of the entire machine may now. be summarized. After the die halves 22 and 24 have been accurately set up in the machine, they are coated with an oil solution so as to prevent the casting from sticking. The carriage 25 is now operated to move toward the furnace end, by

' the aid of the spoke wheel 38. The eccentric shaft 40 is then disenga ed from the link 32, and the shaft 39 revo ved by the wheel- 38 to efl'ect an oil tight joint between the die halves. The cores may now be inserted by the aid of the motor 118, and the air within the die is exhausted in any well known manner. The gooseneck 47 is charged with metal by dipping it within the pot 49, with the aid of lever 53. The lever 62 is then operated to bring the gooseneck into registry with the sprue hole of the die and into the position of Fig. 2. The pin 66 is rotated to seal this connection. Airunder pressure is now admitted through pipe 50 and the metal is squirted thereby between the, dies. The

pressure is then released, and the gooseneck 47 is moved away. The sprue cutter 72 is now operated by the aid of lever 83, and the sprue is ejected into the pct 49. The cores if there are any are then pulled by starting motor 118. The carriage 25 may now bebrought to open position by the aid of spoke wheel 38. To extract the casting, the lever 92 is operated, which causes the plate 86 to push the posts 87 into the die half 24, and engage the castin With the aid of my mac ine, dies of. widely varying form may be accommodated and easily used. This is .due tothe various adjustments I provide, as in the sprue cutter and core puller. Furthermore the movement of the carriage and sealing of the die halves is effected without undue effort by the aid of the eccentric arrangement in the toggle mechanism. r

I claim: t 1. In a die casting machine, a stationary die head, a carriage, 'a movable die head fastened to the carriage, a guide for the carriage, and means for adjusting the carriage with respect to its guide.

2. In a die casting machine, a stationary die head, a carriage, a movable die head fa'sriage, and means for adjusting the center ofthe rollers with respect to the carriage.

3. In a die casting machine, a stationary die head, a carriage, a movable die head fastened to the carriage, rollers for the carriage, and a shaft for the rollers, said shaft having an eccentric portion adjustably held in the carriage.

4. In a die casting machine, a stationary die head, a movable die head, and means for urging the heads toward each other, comprising a lever for causing the initial movement, and means acting on one end of the lever for producing a relatively small movement.

5. In a die castin machine, a pair of relatively movable dielieads, a toggle for moving the heads relatively to each other, and a shaft having an eccentric portion forming the pivot point for one of the toggle members.

6. In a toggle mechanism, a link forming one of the toggle members,- and a shaft having an eccentric portion forming the pivot point for the link.

7. In a die casting machine, a pair of relatively movable die heads, and means for moving the heads relatively to each other,

comprising a lever, a rotatable shaft having an eccentric portionupon which the lever is supported, and means' for mechanically clutching and unclutching the shaft and lever. g

8. In combination, a lever, a rotatable shaft having an eccentric portion upon uthich the lever is supported, and means for -mechanically clutching and unclutching the shaft and lever.

9. In a die casting machine, a air of relatively movable die heads, togge links for moving the heads relatively to each other, a shaft having an eccentric portion serving us'one of the link pivots and a sliding key on the eccentric portion adapted to be moved into a keyway formed in the link.

10. In combination, toggle links, a shaft having an eccentric portion serving as one of the link pivots, and a sliding key on the eccentric portion adapted to be moved into a keyway formed in the link.

11. In a toggle mechanism for operating the movable die head of a die castin machine, a link for the toggle havin a ifurcated portion, a stationary shaft aving an eccentric portion passing through the bifurcations, a key slidable in the eccentric portion between the bifurcations, a sprin in the shaft urgingthe key toward one o the bifurcations sald bifurcations having a key way in which the key may slide when in alinement, means for rotating the shaft, and means for urging the key in a direction away from the keyway.

12. Ina die casting"machine, means for eriracting the casting fromfithe ldie 'comprising a die head, a guide having a rack, out therein, said guide being. arranged 1n r back of the die'lhead, a member slidablysup-Q ported by the guide, a pinion rotatablysu I ported on the'member and meshing with at e rack, and means for rotating the pinion.

mounted in slots inthe plate.

direction.

against the casting.

for supplying 'Z'3.'In a die casting machine, means for extracting the casting from the die comprisinga die head, a movable plate supported in back-of the head, and posts adjustably mounted onthe plate for exerting a pressure 14. In a die casting machine,means for extracting the casting from the die, comprising a' die head, a late movably supported with respect to t e head, means for moving the plate, and posts adyustably 15 In a diecasting'machine, a container forsup lyingmetal to the interior of, they die, an m eans for controlling the move ment of the container comprisinga vertical guide for the container and means for moving the guideiin a substantially horizontal 16. In adie castingmachine, a container .metal to the interior of the die, a 'vertica guide for the containergand a toggle for moving the guide toward the sprue. hole of the die. I I

17. In a die casting machine,.a container for S11 plying metal ,toythe interior of the die a ever system for moving the container toward the sprue opening of the-die, and a shaft having an eceentrlc portion forming one of the pivots for the lever system,

-18. In adie casting machine, acontainer for supplying metal to the interior of the die, a togglelink mechanism for moving the container toward the :sprue hole of the die.

and a pivot shaft for one of the links rotatably mounted on a moving portion 0f the container, said shaft havin 'an eccentric portion forming the pivot or one of the toggle links'.' y

19 In a machine' for making castings in a .die having a threaded core, means for moving the core in and, out of the die, comprising a rotatable shaft, and a sliding mechanical connectionhetween the shaft andthe core. .V I a 20. In amachine for making castings in a a. die having a core, means for moving the core in-and out of the vdie, comprising a retatable shaft, and a gear connection between the shaft and the core.

21'. In a machine for making castings in a die having cores, a pluralitg y the shafts,

as die havinga core, a rotatable shaft for V transmitting a force to the core to move it in and out of the die,

machine.

g 221 In a machine for making castings in a time having a'core, a rotatable shaft for transmitting a force; to the core to moveit in and out of the die, and a driven member to be connected to the core.

In a machine. for making castings in a die having cores, a plurality'of core pulling means, a singlemeans for movin all ofithe co e pullers, and means whereby the sequence of operation of" thepulle'rs may be determined 4 24, In a machine for" making castings in a die having cores, a pluralityiof rotatable shafts, a pluralityof core pulling meansassociated with the shafts, a single means for I and a bearing support. 0;- the shaft adjustably mounted on the axiallv slidable along the shaft and-adapted core pullers operated by the shafts, and a a common means for rotating all the shafts.

27. In a machine for making castings in a die having cores,'a plurality of rotatable shafts, cranks carried by the shafts, core pullers operated bythe shafts, a drum rotatably mounted on each shaft, a shoe ad-- ustably mounted in each drum and adapted to coact with the crank, and a common means for rotating the drums.

28. Ina die casting machine, a die head, a arriage for the die head, a guide rails for the carriage, means for moving the carriage, and means for adjusting the extremes of travel of the carriage comprising a member forming a pivotfor the moving means, and slidable on the rails, and means for vary'ng the position of the slidable member onthe rails.

In testimony whereof, I have hereunto set my hand. t

' JOHN B. USHNELL.

plurality of 

